Ok. This is a difficult Jaguar question. I own a Jaguar Service Center and I can tell you now that this problem needs to be taken to a Certified Jaguar service center for repair. Your Welcome for my response.
Make sure the retaining bolts are removed. Take a rubber mallet and tap on the alternator to free it from its position.
Battery light usually means alternator not charging. Most common solutions would be be a bad alternator, bad connection, or loose alternator belt. If the battery and alt test ok than check the connections to the alternator and battery.
A light is on or a relay is stuck pulling power from the battery.
Check the belt on your alternator. If it is not tight enough it will squeal on a Rodeo. Be sure to get it checked soon or your belt could fall off or burn up your alternator and then you are stuck!!
If the battery is brand-new and I would suspect either the alternator is defective or you have a lightbulb somewhere on the vehicle that is pulling power from the battery. It can also be a relay that is stuck.
Your battery charge will get so low eventually car won't start and you will get stuck somewhere.
Get the vehicle home or to a garage as soon as possible or you may get stuck on the road.
Something is on drawing power. Can be any light on the vehicle or a relay stuck.
After you remove the alternator from the engine, you can take it out from lower side of the engine. There are two ways you can get take it out. One way is to remove the CV joint and take the alternator out. The other way is to remove the exhaust pipe under the engine and remove the alternator. I used the second way because I could not remove the CV joint in my case. The bolt stuck and I could not get it off.
If you install a new battery & new alternator and the battery runs down overnight then you have something pulling power from the battery. Look for any light on the vehicle that is on or a relay that is stuck.
Dead cell in the battery. A light on anywhere on the vehicle. A relay that is stuck. Defective alternator.
You are having a problem with the charging system. It could be a failing alternator. Have your local auto parts store test the charging system to determine what the problem is for free. Don't ignore it, you may get stuck.